adds line break between references 🎱

Author: seajoshc

README.md

@@ -27,4 +27,5 @@ pprint(codepipeline.event)
 
 # References
 [AWS Lambda Event Sources](http://docs.aws.amazon.com/lambda/latest/dg/eventsources.html)
+
 [AWS ARNs](http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html)